SLVS074I January 1983 – July 2022 TL494
The power supply was designed for a 10-A load current and an IL swing of 1.5 A, therefore, the short-circuit current should be:
The current-limiting circuit is shown in Figure 10-4.
Resistors R1 and R2 set the reference of approximately 1 V on the inverting input of the current-limiting amplifier. Resistor R13, in series with the load, applies 1 V to the non-inverting terminal of the current-limiting amplifier when the load current reaches 10 A. The output pulse width reduces accordingly. The value of R13 is calculated in Equation 11.